Here is the bible's definition of a leader found in 2 Samuel 23:3-4 -(Webster's Bible Translation)
3 The God of Israel said, the Rock of Israel spoke to me, He that ruleth over men must be just, ruling in the fear of God.
4 And he shall be as the light of the morning, when the sun riseth, even a morning without clouds; as the tender grass springing out of the earth by clear shining after rain.
David goes on to say:
5 Although my house is not so with God; yet he hath made with me an everlasting covenant, ordered in all things, and sure: for this is all my salvation, and all my desire, although he maketh it not to grow.
I thought of this passage while reading Jonathan's blog, and the post on Nancy Pelosi.